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3 years ago

A 4.5 kg bowling ball rolls down a 500m hill. How much potential energy does it lose?

Physics

1 answer:

lions [1.4K]3 years ago

8 0

Answer:

22050 J

Explanation:

Given Mass of the ball, m = 4.5 Kg

Height, h =500 m

Acceleration due to gravity, $g= 9.8m/s^{2}$

To calculate the potential energy we use formula,

$PE = mgh$

Substituting the given values, we get

PE = 4.5× 9.8×500

=22050 J

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The chemical equation below shows that hydrogen and oxygen chemically react to form water.

shutvik [7]

Answer:

Explanation:

Hydrogen, oxygen, and water are pure substances that each have different properties.

Although the 3 of them are pure substances, but they nonetheless have different properties. These properties could either be their physical properties, or their chemical properties. This is particularly so because since Oxygen and Hydrogen the major components in water have different properties, it is only right if their product, water, has different properties also.

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3 years ago

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The strong crystal structure of an ionic compound is one of the main reasons why ionic compounds have a __________ melting point

Elza [17]

The answer is a because it has a high melting tolerance

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4 years ago

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A 100-m-long wire carrying a current of 4.0 A will be accompanied by a magnetic field of what strength at a distance of 0.050 m

solong [7]

Answer:

1.6 x 10^-5 T

Explanation:

i = 4 A

r = 0.05 m

The magnetic field due to long wire at a distance r is given by

$B = \frac{\mu _{0}}{4\pi }\times \frac{2i}{r}$

B = 10^-7 x 2 x 4 / 0.05

B = 1.6 x 10^-5 T

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4 years ago

if a ball is thrown horizontally from the first floor of a building (5.0 m from the ground) at a speed of 5.0 m/s, where will it

r-ruslan [8.4K]

The ball will be 49.5m from the base when it hits the ground based on 9.8m/s² earth gravity.

what is earth gravity?
Gravity is the force by which a planet or other body draws objects toward its center. The force of gravity keeps all of the planets in orbit around the sun.

Why do things fall down when you throw them or drop them? The answer is because gravity ; an invisible force that pulls objects toward each other. Earth's gravity is what keeps you on the ground and what makes things fall.

First, let's try to find the time taken by ball to reach the ground :

$-h = 0 - \frac{1}{2}gt^{2}$

t = $\sqrt{2gh}$

t = $\sqrt{2*9.8*5$

t = 9.9 s (rounded)

Next, we will find the horizontal distance covered by ball :
D = v*t
D = 5 * 9.9

D = 49.5m

Therefore, the ball will be 49.5m from the base when it hits the ground for the first time based on 9.8m/s² earth gravity.

Learn more about earth gravity brainly.com/question/11174601

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1 year ago

We can study how galaxies evolve because ______.A) Galaxies are transparent to visible light.B) We are really smart astronomers.

saul85 [17]

We can study how galaxies evolve because the farther away we look, the further back in time we see.

Answer: Option D

<u>Explanation:</u>

As the galaxies are located far away from us and also as per the broad band theory, these galaxies are spreading as the time goes. So as time passes, the galaxies are moving further light years away.

So depending upon the time taken for the light waves to reach Earth from these galaxies will state the time they have evolved. So the farther or more lately the light reaches the earth surface, the further time back we can see its evolution. Thus option d is correct choice.

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4 years ago